I find myself living in the frozen northern half of New Hampshire these days. Up here there is a winter event known as a Primitive Biathalon, the idea is basically to slog around a course in wood frame snow shoes and shoot some steel targets ever so often using a non-inline muzzle loader. They take time off of your total for hits. (shooting seems to be in the 35 to 50 yard range)
I have a P-H '61 short rifle (Musketoon) that I currently shoot for fun with cast minie's and ff or 1.5f (I shoot Swiss and Schutzen, I keep them around for my BPCR). My dilemma is that the rules specify round balls only.
Looking for recommendations and advice?